Metallic insulator-pin.



0. G. ETTE.

METALLIG INSULATOB. PIN.

APPLIGATIOH Hmm 11110124, 1907.

905 ,414. Patented Dec. 1, 1908.

iyi

mn'm'/l UNITED STATES PATENT OFFICE.

CHARLES G. ETTE, OF ST. LOUIS, MISSOURI, ASSIGN OR TO ETTE INVESTMENTCOMPANY, OF ST. LOUIS', MISSOURJ., A CORPORATION OF MISSO-URI.

-HETAILIC INSULATOMIN.

Specification of Letters Pabent.

Patented Dec. l, 1908.

To all 'whom fit may concem:

Be it known that I, CHARLES G. Errn, a Citizen of the United States,residin'g at St. Louis, Missouri, have invented ia certain new anduseful Improvement in Metallic Insulator-Pins, of which the following isa full,`

clear, and exact description, such-as will enable others skilled in theart to which it appertains to make and use the same, reference being hadto the accompanying drawings, forming part of this specification, inwhich Figure 1 is a side elevation of an insulator pin constructed inaccordance with my invention, said figure also showing in Section.

an insulator mounted on said pin; Fig. 2 is a side elevation of said pintaken at right angles to Fig 1; Fig; 3 is a longitudinal sectional viewof the pin; Figz'll is an enlarged cross sectional view taken on theline 4 4 of Fig. 2;Fig.- 5 is a cross sectional view taken on the line 55 of Fig. 2; F ig. 6 is a cross sectional view takenon the line 6 6 ofFig;

i 3; and F ig."7 is a cross sectional view of a oneiece pin.

'T 's `invention relates to insulator pins; nanely, devices that areemployed for supporting insulators such as are generally used nconnection with electric wiring.

The main object of my invention isto provide'a metallicinsulator pinwhich is so constructed that the expansion of the metal from which thein is formed will not cause the insulator to break.

other object of my invention is to provide a metallc insulator pinhaving means of novel Construction for preventing the pin from turningor pulling out of the support in which itv s mounted. And still anotherobject of my' invention is to provide a me- 'tallic insulator pincomprising a plurality of longitudinally extending slot l-is formed in'the screw-threaded portion of the pin so as to'produce two separateparts that can move nwardly orV toward each other when the metal inthepin expands and thus prevent breakage of the insulator which isusually formed of some fragile material such, for example, as glass orporcelain. The slot 1 in the pin provides for theexpansion of the pin inone direction, namely, in the direction indicated by the arrows a inFig. 4, and' 'to provide for the exp'ansi'on of the pin in the oppositedirection, as indicated by the arrows in said figure, form the screwthreads 2 on the pin oval instead of round so that the coperating screwthreads on the interior of the insulator will .bear closelyV on thethreads of the pin at onlytwo points instead of completely around thepin. In V other words, I provide the pin with screwthreads of such shapethat the insulator bea-rs snugly on only two sides of the pin andprovide the pin with one ormone lon tudinally extending slots thatpermit t e portions of the pin which are 'snugly embraced by theinsulator to move inwardly or toward each other when the metal in thepin expands.

o he pin is rovided at its lowe` end with a plurality of separated ribshavingtranfsversely extending serrations or teeth 3 'so that when the pnis driven into a. support C theseteeth or serrations will bite into thesupportl and thus prevent the pin from drawing out or becoming;accidentall V displaced. By separating the' serrate' ribs from each'other I produce longitudinall)7 extending channels 4 which are filled byportions 4' of the support when the pin is in operative position, asshownin Fig. 5, so that itwill be impossible for the pin to rotate orturn in the support. This is a very desirable feature of an insulatorpinfor during theoperation of applyingv the'insulator or removing it ,fromthe` pn, the in is Vsubjected to great torsional strainlwhch" tendstomake it turn or rotate in the support. I' prefer to form the serrated ortoothed ribs 3 slightly tapered, as shown in Fig. 1, so as to preventthe pin from being driven too far nto the support. The pin" ishollowiandlis preferably formed in two sections 5 and 6 that' are provi'ed on their ,longitudinal edges with inter] king teeth Iwhich extendthroughout the entireV lengthof the. unscrew-threaded portion of thepin, the longitudinal edges of said sections being spaced away fromeachother lat the upper; end. of the pin to form the slots 1. The pin isformed of cast metaland the main .advantage of forming it in sections'isthe low cost of manufacture.

The section 6 of the pin isprovided onits.

.one end with a plurality o interior with lugs 7 as shown in Figs. 3 and6, which are 'embraced by'thel section 5 of the pins When said sectionsare placed ether, said lugs preventing one Section rom being movedtransversely relatively to the other section'when'the sections areplaced together preparatory to inserting the pin in the opening in thesupport C.v I also prefer to form'an opening 8 in the lower end of thepin, as shown in F ig. 3, so a s to prevent Water from collectin in thepin.

While I prefer to %orm the pinin sections, as previously described, itwill, of course, be

understood that so far, as the screw-threaded portion and the serratedportion of the pin are concerned, it is immaterial whether the pin isformed in one 7 or in two sections, as shown 'in the other tigures ofthe drawing, for the two sections of the pin are placed together beforethe pin is inserted.

l-laving thus described my invention, what I claim as new and desire tos'ecnre by Letters Patent is:

1. A metallic insulator pin provided at one end With a longitudinallyextending slot Which provides for the expansion of the pin in onedirection, and screw-threads of approximately oval shape that areadapted to coperate With screW-'threads of substantially circular shapeon an insulator and thus provide for the expanson of the pin intheopposite direction; substantially as described.

2. A metallic insulator in provided at fpseparated parts which providefor' the expans'ion of the pin in one direction, and screw-threads ofapproximately oval shape that are adapted to coperate with screw-threadsof substantiallly circular shape on an insulator and thns provide forthe eXpans'ion-of the pin in the opposite direction; substantially asdescribed.

3. A metallic insulator pin provided. at

piece, as shown in Fig.

one end with a pluralityof longitudinally extending slots which provideforthe expansion of the pin in one direction, and screw-threads ofapproximately oval shape that are adapted to coperate with screwthreadsof substantially circular shape on an insulator and thus provide for theeX- pansion of the pin in the opposite direction; substantially asdescribed.

4. A hollow insulator pin formed of metal and having a slot whichprovidesforthe expansion of the pin in one' direction, and screw-threadsof approximately oval shape that are adapted to coperatewithscrewthreads of snbstantially circular shape on an insulatorvandthus provide for the expansion of the pin in the opposite direction;substantially as described. 1

5.. A cast metal insulator pin consisting of a plurality of sectionsthat are provided on their longitudinal edges with interlocking teeth,and means independent of said teeth for preventing one Section frombeing moyed transversely of the other Section when they, are placedtogether; substantially as described.

6. A metal 'insulator pin .comprising a. plurality of sections providedon their longitndinal edges with interlocking teeth, and lugs on oneseetion which are embraced by the other Section when said sections areplaced together; substantially as described.

7. A hollow insulator pin formed of metal and consisting of two semi-cylindriealshaped sections that are providedl on their longitudinaledges with interlocking teeth; substantially as described. f

In testimony'whercof I hereunto affix my Signature in the presence oftwo witnesses, this nineteenth day of December 1907.'

CHARLES G. ETTE,

Witnesses:

EDJWARD SCHWIDDE, BERNARD J. BURRICHTER.

